1, diuretic effect: Caffeine and theophylline in tea have diuretic effect and are used to treat edema and stagnant tumors. Acute icteric hepatitis can be treated by detoxification and diuresis with black tea syrup.

2. Cardiotonic and antispasmodic effects: Caffeine has the effects of cardiotonic, antispasmodic and relaxing smooth muscle, can relieve bronchospasm and promote blood circulation, and is a good auxiliary drug for treating bronchial asthma, relieving cough and resolving phlegm, and myocardial infarction.

3, inhibit arteriosclerosis: tea polyphenols and vitamin C in tea have the effect of promoting blood circulation and removing blood stasis to prevent arteriosclerosis. Therefore, among people who often drink tea, the incidence of hypertension and coronary heart disease is low.

4. Antibacterial and bacteriostatic effects: Tea polyphenols and tannic acid in tea act on bacteria, which can solidify the protein of bacteria and kill them.

5. Weight-reducing effect: Caffeine, inositol, folic acid, pantothenic acid and aromatic substances in tea can regulate fat metabolism, especially oolong tea has a good decomposition effect on protein and fat.

6. Anti-caries effect: Tea contains fluorine, and fluoride ions have great affinity with calcium in teeth, which can become a kind of "fluorapatite" that is difficult to dissolve in acid, just like adding a protective layer to teeth, which improves the ability of teeth to prevent acid and caries.

7. Inhibitory effect on cancer cells: It is reported that flavonoids in tea have different anti-cancer effects in vitro, and the stronger ones are vitexin, morin and theanine.